Newly planted red maple not budding out

We planted a red maple last October in North Texas. This spring, it has started to leaf out, but then about half of the leaves died. It doesn't seem to be recovering. Just today, I have watered with fish emulsion, but wondered if there is anything else I can do. Thanks for your help!!

Did you have a dip in temperatures after the tree had began leafing out?
Since it was a newly planted tree were you maintaining a regular watering schedule to establish the root system?

If the branches or limbs are still pliable they are most likely still alive, if they dry and become brittle they have died off.
I would not give up yet, but continue to care for the tree with regular watering.
Best of luck.